Known Issues

The Query API ModifyInstanceAttribute request does not allow the block-device-mappings to be modified and the user-data attribute cannot be modified if it already contains data.

Paid AMIs Backed by Amazon EBS

AMIs backed by Amazon EBS are not currently supported by Amazon DevPay.

Windows Reserved Instances

Reserved Instances are not currently available for Windows.

Windows AMI launch times

Windows AMIs take longer to launch than Linux/UNIX instances due to larger AMI sizes and multiple reboots.

Windows AMI sizes

Installing software on Windows AMIs can cause them to become large and easily reach the 10 GB limit. Before bundling, check the size of the C:\ volume.

Limitation on drive mapping

There is currently no support for volume attachment to devices beyond /dev/sdp on instances running Linux/UNIX and xvdp on instances running Windows.

Security group limitation

AuthorizeSecurityGroupIngress does not allow port ranges for group grants when using the command-line tools or the Query API. This is only supported through the SOAP API.

Instance limit

New users are limited to a maximum of 20 concurrent instances, but many of our customers use hundreds or thousands of instances. If you need a higher limit, go to http://www.amazon.com/gp/html-forms-controller/ec2-request.